Preheat oven to 425°. Cut acorn squash in half, scoop out seeds and discard (or save for roasting).Spray a baking sheet with cooking spray or rub a little coconut oil over sheet. Slice a small piece off bottom of each squash half just enough to level. Rub a little coconut oil over the flesh of each half and sprinkle with cinnamon. Set squash halves, cut side down, on prepared sheet. Bake for 40-50 minutes until squash is golden and flesh is easily pierced with the top of a paring knife.Let squash cool for 5-10 minutes. Add ½ cup yogurt to each squash bowl and top with toppings of choice. To save on time, you can pre-roast the acorn squash, let it cool and then place it in the fridge. Just reheat it for a few minutes when you're ready to make your yogurt bowl.